Power device



March 3l, 1931. l.. F. KoTT POWER DEVICE Filed April 25, 1928 Patented Mar. 3l, 1931 UNITED STATES LEO F. KOTT, O F DETROIT, MICHIGAN POWER DEVICE Application led April 23, 1928. Serial No. 272,268.

This invention relates to power devices and has particular reference to a power shaping device.

This application is a companion case to my co-pending application on a Power hammer,

Serial No. 211,591 tiled Aug. 8, 1927.

An object of this invention is to provide a power shaping device including an impact member, an anvil member, and means for le maintaining the anvil member in a position adjacent `the impact member.

A further obj ect of this invention is to provide a power shaping device having animpact member and anvil member, and means l5 for locking the anvil member in a position spaced from the impact member to provide a clearance between the anvil member and impact member. 4

Still another object of this invention is to .0 provide a power shaping device having means for limiting the movement of the anvil member toward the impact member.

A still further object of the'invention is to provide 4a power shaping device having an '25 impact member, an anvil member, and means for assuring an alinement of the anvil member with the impact member.

'Other objects and advantages oi: this invention will become apparent as the follow- IM inv description proceeds, particularly when re erence is had to the accompanying drawings wherein:

Fig. 1 is an elevational view of a power shaping device constructed in accordance with the teachings of this invention;

Fig. 2 is an enlarged detail sectional view of a portion of the device shown in Fig. 1; and

Fig. 3 is an enlarged detail sectional view of another portion of the device.

The invention contemplates particularly the provision of a tool for reshaping automobile bodies and Jfenders, although it is to be clearly understood that the invention may have many and other varied uses. One of the most common jobs of automobile repair shops of today is to straighten out bent fenders or to smooth out distorted portions of vehicle bodies.. To accomplish this the 5 vehicle fender or body is generally bumped or struck a number of blows with a hammer. The old practice was to do this work by hand but obviously such practice required considerable time and made the task quite an expensive one. The modern practice therefore is to use a power hammer to bump the bent parts of the fenders or body of the vehicle and the present invention contemplates the provision of a device which in cludes a -power hammer and an anvil for carrying out such a bumping operation.

In use the anvil is adapted to bevpositioned on one side of the portion of the body to be bumped, while the power hammer is adapted to be positioned on the opposite side of the portion of the body. During the bumping operation the anvil and power hammer must be maintained in juxtaposition with respect to each other, but in order to position the anvil and hammer in this relation with respe`ct to each other, means must be provided for eiecting a clearance between the anvil member and power hammer so that the tool may readily be positioned at .the desired points. Accordingly the present invention contemplates the provision of a device in which the anvil member is normally held in a position adjacent the power hammer but in which means are provided for effecting a movement of the anvil member away from the power hammer to permit the aforesaid positioning.

Referring now particularly to the drawings wherein like reference characters designate corresponding parts throughout all views, 5 designates a power hammer which may be constructed in accordance with the teachings of my copending application, Serial No. 211,591. This power hammer includes the casing 6 and impact member 7 adapted to be reciprocated by suitable mechanism (not shown), all of this structure being full i described in my co-pending appli-- cation a ove-mentioned.

For providing a swivel support for the power hammer, the casing 6 is provided with a flange 8 and a threaded portion 9 adapted to receive a nut 10. The eye 11 of a supporting arm 12 rotatably embraces the casing 6 between the iiange 8 and the nut 10, whereby the hammer is rotatably supported at the free end of the arm 12.

Mounted in spaced relation to the supporting arm 12 in a manner hereinafter to be more fully described, is a supporting arm 13 adapted to support an anvil member 14 adjacent the impact member 7. The anvil member 14 comprises a cylindrical body portion 15 provided with the tapered end 16 counterbored as at 17 to receive the shank 18 of a face plate 19. The face plate 19 is adapted to engage the opposite side of the portion of the body or fender being struck by the impact member 7.

For slidably supporting the impact member 14 on the supporting arm 13, the arm 13 is provided with a laterally extending stub shaft or pin 20 which as clearly shown in Fig. 2 of the drawing, may be provided with the ange 21 adapted to engage one side of the arm 13 and the nut 22 adapted to engage the other face of the arm 13 whereby the pin 20 is rigidly secured to the arm 13. The stub shaft or pin 20 is provided with the reduced extension 23 adapted to engage in a bore 24 extending longitudinally of the anvil member 14. The bore 24 opens into an enlarged bore 25 formed in the anvil member 14, the bore 25 being of a sufficient diameter to receive the pin or stub shaft 20. The bore 24 is partially closed at its outer end as by the shoulders 26 whereby the extension 23 is prevented from engaging the shank 18 of the face plate 19. A spring 27 is coiled around the extension 23 within the bore 25 and engages at its one end the shoulder 28 defining one end of the bore 25 and at its other end the end 29 of the pin 20. The spring 27 is a compression spring and tends to force the anvil member 14 outwardly toward the impact member 7.

For retracting the anvil member to draw the same away from the impact member 7 and to thereby provide clearance between the face plate 19 and impact member 7,there is provided a lever 35. This lever 35 is pivoted at its upper end tothe ears 36, which ears are rigidly secured to the free end of the supporting arm 13 as by a riveted pin 37. The lever 35 is connected intermediate its ends to the anvil member 14 by means of a tubular member 37 threaded into the body 15 of the anvil member 14 as at 38. The tubular member 37 projects outwardly from the rear of the anvil member 14 and extends freely through an opening 38 formed in the upper end of the supporting arm 13. A flexible member 39 is rigidly secured to the inner end of the member 37 and this flexible member is connected at its other end to the ears' 40 secured to the lever 35 as at 41. The tubular member 37 may be slotted as at 42 to permit movement of the flexible member upwardly out of the free end of the tubular member 37.

The lever 35 is adapted to be moved from the full line position shown in Fig. 2 to the dotted line position shown in this figure. When thus moved, the anvil member 14 is drawn toward the supporting arm 13 against the tension of the spring 27, the anvil member being adapted to assume the position shown in dotted lines. In this manner clearance may be provided between the face plate 19 and the impact member 7 whereby the impact member 7 and the face plate 19 may be readily positioned on opposite sides of the surface to be bumped.

For locking the anvil member in retracted position there is provided a catch 45 pivotally mounted on the upper face of the anvil member 14 as by a pivot pin 46 threadedly mounted in the body portion 15 of the anvil 14. One end 47 of the catch 45 is adapted to engage the free end of the supporting arm 13 and the other end of the catch 45 is normally urged upwardly by coil spring 48 seated in a recess 49 in the body 15. The free end of the supporting arm 13 is beveled as at 50 whereby when the anvil member is retracted the end 47 will ride up over the free end of the arm 13 and will'engage back of this arm as clearly illustrated in dotted lines in Fig. 2. To release the catch 45 it is only necessary to depress the outer end of the same against the tension of the spring 48 whereupon the hooked end 47 will be released and the spring 27 will force the anvil member 14 outwardly to its normal position.

For limiting the projection of the anvil member 14 by the spring 27 a member 55 is provided. This member may be in the nature of a bolt threaded into the lever 35 as at 56 and provided at its outer end with the wings 57 whereby it may readily be rotated. The inner end 58 of the member 55 is adapted to engage the arm 13 as clearly shown in Fig. 2 .of the drawing. Obviously engagement of the end 58 with the arm 13 limits inward movement of the lever 35 and thereby limits projection of the anvil member 14. By threading the member 55 through the lever 35 the projection of the anvil member 14 may be increased or diminished at the will of the operator.

For supporting the arms 12 and 13 in spaced relation to each other there is provided a U-shaped supporting bracket 60. This U-shaped supporting bracket is provided with the base 61 which may form a handle portion and is provided with the legs 62 and 63 adapted to receive the supporting arms 12 and 13 respectively. If desired a cross member 64 may connect the legs 62 and 63 to brace the same. The arms 12 and 13 are adapted to be slidably received within the tubular legs 62 and 63 whereby the arms 12 and 13 may be longitudinally adjusted to vary the distance of the anvil member 14 and power hammer 5 from the base 61.

For assuring the alinemcnt of the anvil member 14 with the impact member 7, the structure shown in Fig. 3 is provided. For the purpo-se of illustration the supporting arm 13 only is illustrated, since the supporting arm 12 is identical with the supporting arm 13. The supporting arm 13 is provided with a plurality of spaced apertures 65, these apertures being arranged longitudinall of the supporting arm 13 in a predetermined spaced relation with respect to each other. The free end of the leg 63 is provided with a boss 66 provided with the bore 67 for receiving a. pin 68. The inner end 69 of the pin 68 is adapted to be selectively positioned in any one of the apertures to position the arm 13 longitudinally of the leg 63.

For urging the pin 68 inwardly to maintain its end 69 in the selected aperture 65, a spring 70 is provided, which spring surrounds the pin 68 and bears at one end on the flange 71 carried by the pin 68 and at its other end on a cap-piece 72 threaded on the boss 66. The flange 71 serves not only as an abutment'for the spring 70 but serves also to limit inward movement of the pin 68 by engaging the face of the supporting arm 13. A suitable knob 72 may be provided on the free end of the pin 68 for drawing the pin 68 outwardly against the Vtension of the spring 70.

. For locking the arm 13 in adjusted position in the leg 63, the leg 63 is provided with a boss 75 (provided with the bore 76 internally threade to receive a set-screw 7-7, whose inner end 78 is adapted to engage the supporting arm y13 when the set-screw 77 is screwed inwardly to impinge upon the arm 13 to lock the same in adjusted position.

As brought out before, the arms 12 and 13 are identical in construction and the leg 62 is provided with a positioning mechanism similar to the pin 68 described with reference to the leg 63. In operation therefore, it is only necessary to engage the pins 68 in corresponding apertures 65 in the legs 12 and 13 to assure an alinement of th-e anvil member 14 l with the impact member 7.

The supporting of the arms 12 and 13 in the legs 62 and 63 serves a further lpurpose in that these arms may be rotated in their respective legs to-provide a still further clearance between the anvil member 14 and the impact member 7. If therefore, it is necessary in positioning the impact member 7 and the anvil member 14,. to pass these Amembers around a pillar of the vehicle, it is only necessary to release the positioning mechanism and the set-screw 7 7 and to rotate the arms 12 and 13 within their respective legs whereby the members 7 and 14 will'be swung away from each other to provide a clearance substantially the same as the space between the supportin arms 12 and 13. After the membersfhave een'positioned they may be swung back to their original or operative positions.

From the above, it is believed that the operation of the device will be readily apparent. The anvil member 14 is adapted to be positioned on one side of a. surface while the impact member 7 is adapted to strike a number of blows on the other side of the surface. The invention will find particular utility in bumping vehicle bodies and fenders, but may be used with equally advantageous results in 1. In a device of the character described,

an impact member, an anvil member, a spring urging said anvil member-toward said impact member, and means for moving said anvil member away from said impact member against the tension of said spring.

2. In a device of the character described, an impact member, an anvil member, a spring urging said anvil member toward said impact member, and means for moving said anvil member away from said impact member against the tension of said spring, said means including a pivoted lever and a connection between said lever and said anvil member.

3. In a device of the character described, an impact member, an anvil member, a spring urging said anvil member toward said imanvil member away from said impact member against the tension of said spring, said means including a pivotally mounted lever, and a flexible element connecting said lever to said anvil member.

4. A power shaping device includingiin f.

combination a pair of spaced supporting arms, a power hammer carried by one of the said arms, an anvil member carried by the other of the said arms, a spring urging the anvil member to a position adjacent the power hammer, means for retracting the anvil memberto provide clearance between the anvil member and the power hammer, and means for locking the anvil member in retracted position. g

5. A power shaping device including in combination a pair of spaced supporting arms, a power hammer carriedm by one of the said arms, ana-nvil member carried by the other of thesaid arms, a spring urging the a anvil memb'ei'f'ftdl a position adjacent the power hammer, means for retracting the anvil member to provide clearance between the anvil member and the power hammer, and

means for locking the `anvil member in relpact member, and means for moving said tracted position, said last-mentioned means including a latch pivotally carried by said anvil member.

6. A power shaping device, including in combination a pair of spaced supporting arms, a power hammer carried by one of the said arms, an anvil member carried by the other of the said arms, a spring urging the anvil member to a position adjacent* the power hammer, means for retracting the anvil member to provide clearance between the anvil member and the power hammer, and means for locking the anvil member in retracted position, said last-mentioned means including a catch carried by the anvil member, said catch being adapted for engagement with the anvil member supporting arm, and a spring for maintaining said catch in engaged position.

7. A power shaping device including in combination a pair of spaced supporting arms, a power hammer carried by one of the said arms, an anvil member carried by the other of the said arms, means constantly urging the anvil member toward the said power hammer, and means limiting movement of the said anvil member toward the said power hammer.

8. A power shaping device including in combination a pair of spaced supporting arms, a power hammer carried by one of the said arms, an anvil member carried by the other of the said arms, means urging the anvil member toward the said power hammer, and means limiting -movement of the said anvil member toward the said power hammer, said last-mentioned means being adjustable to vary the relation of the anvil member to the power hammer.

9. A power shaping device including in combination a pair of spaced supporting arms, a power hammer carried by one of the said arms, an anvil member carried by the other of the said arms, a spring urging the anvil member toward the said power hammer, a lever for retracting the said anvil member, and a threaded member carried by the'said lever and'engageable with the anvil member supporting arm for limiting movement of said an`vil member by the said spring.

l0. A power shaping device including in combination a U-shaped member, a supportting arm adjustably carried by each leg of the U-shaped member, a power hammer carried by one of the supporting arms, an anvil member carried by the other of the supporting arms, and means for facilitating the alinement of the anvil member with the power hammer.

11. A power shaping device including in combination a U-shaped member, a supporting arm adjustably carried by each leg of the U-shapedcmember, a power hammer carried by one o the supporting arms, an anvil member carried by1 the other of the supporting by one of the supporting arms, an anvil member carried by the other of the supporting arms, and means for facilitating the alignment of' the anvil member with the power hammer, said means including a pin carried by each leg of the U-shaped member, said pins being selectively engageable with apertures similarly arranged on the respective supporting arms, and a spring associated with each pin for urging each pin into engagement with the said apertures.

In testimony whereof I aflix my si nature.

LEO F. OTT.

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